SIGNIFICANT ACCOUNTING POLICIES AND OTHER FINANCIAL DATA - INVENTORIES (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Inventory [Line Items]
Natural Gas	$ 164	$ 118	$ 110
LNG	27	7	9
Materials And Supplies	198	183	158
Inventories	389	308	277
San Diego Gas and Electric Company [Member]
Inventory [Line Items]
Natural Gas	0	0	1
LNG	0	0	0
Materials And Supplies	123	104	93
Inventories	123	104	94
SoCalGas
Inventory [Line Items]
Natural Gas	114	94	90
LNG	0	0	0
Materials And Supplies	58	59	46
Inventories	$ 172	$ 153	$ 136